// Copyright (c) 2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#ifndef BITCOIN_KERNEL_CHAIN_H
#define BITCOIN_KERNEL_CHAIN_H

#include <iostream>

//! This enum describes the various roles a specific Chainstate instance can
//! take. Other parts of the system sometimes need to vary in behavior depending
//! on the existence of a background validation chainstate, e.g. when building
//! indexes.
enum class ChainstateRole {
    // Single chainstate in use, "normal" IBD mode.
    NORMAL,

    // Doing IBD-style validation in the background. Implies use of an
    // assumed-valid
    // chainstate.
    BACKGROUND,

    // Active assumed-valid chainstate. Implies use of a background IBD
    // chainstate.
    ASSUMEDVALID,
};

std::ostream &operator<<(std::ostream &os, const ChainstateRole &role);

#endif // BITCOIN_KERNEL_CHAIN_H
